Can contribute to too much algae

A crew from Colorado Parks and Wildlife cruised around Thunderbird Lake in Boulder on Monday scooping up hundreds of bright orange koi that were discovered in the lake this year.

An electric current stunned the fish first, making them easy catching.

Parks and Wildlife officials believe there are roughly 1,500 koi living in the man-made lake in Admiral Burke Park in the Frasier Meadows neighborhood in southeast Boulder.

As non-native species, koi have the potential to upset the ecological balance of the lake.

In particular, koi eat zooplankton, which could contribute to overgrowth of algae. That's already been a problem at the lake as water levels have fallen in recent years. Exotic species can also outcompete native fish species.

Wildlife officials assume the koi were put into the lake by people disposing of pet or ornamental fish.

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